Fog type insulator



" July 21, 1936. J. TfLUSlGNAN, JR 2,048,016

FOG TYPE INSULATOR Original Filed June 2, 1934 INVENTOR; Joseph 71/15/9000 J)? BYQW gK,

ATTORNEY mately one-quarter of an inch. The coating band may be easily applied by a spray gun or other suitable means without interfering with the regular method of assembling the insulator pin in its recess.

tween the pin and porcelain where the electrostatic field is concentrated. Since the cement,

is relatively conducting, the air space between the pin and the porcelain adjacent the termination of the cement is short-circuited by the cement and conducting covering 35, thus preventing difference of potential between the pin and the surface of the porcelain, such as would other- 7 wise cause discharge across this space and consequent radio disturbance.

In the invention shown, a dielectric member is provided having an outwardly and downwardly extending flange providing a canopy, on the lower face of which is formed a downwardly extending skirt cooperating with a baffle disposed entirely within the space enclosed by the canopy and providing a labyrinthine passage which prevents eddy currents of air from depositing moisture or other contamination on the inner face of the skirt and the lower face of the dielectric member within the skirt. By thus protecting the surface of the dielectric member adjacent the pin, the chief source of radio disturbance is overcome. Where the dielectric member adjacent the pin is exposed to moisture, discharges are apt to emanate from the pin out over the surrounding surface, thus giving rise to radio disturbances. This is, of course, aggravated by the presence of dust or other foreign matter on the surface of the insulator about the pin. The embodiment shown also provides an extensive, smooth outer face which is easily washed by rain and thus kept clean. In this way, effective insulation is provided for all weather, even under the most adverse conditions.

I claim:

1. An insulator comprising a dielectric member having an outwardly extending downwardly curved flange, a downwardly extending petticoat on the lower face of said flange, a fitting extend ing downwardly from said insulator, a sheet metal disc of conducting material carried by said fitting and electrically connected therewith and ex-- tending outwardly from said fitting beneath said flange and having a circumferential groove in the upper face thereof registering with said petti coat, said disc serving both as a baflie for pro tecting the surface of said insulator from contamination and also as a flux control to prevent concentration of electrostatic flux and electrical discharge from said pin.

2. An insulator comprising a dielectric member having an outwardly extending downwardly curved flange, a downwardly extending petticoat on the lower face of said flange, a fitting extending downwardly from saidinsulator, a baflle carried by said fitting and extending outwardly beneath said flange and having a circumferential groove in the upper face thereof registering with said petticoat, an open drain for said groove extending through said bafiie, and a cover for said drain but spaced therefrom for intercepting air currents passing through said open drain.

3. An insulator comprising a dielectric member having a recess in the lower face thereof, a fitting secured to the upper face of said insulator, a pin secured in said recess and extending down- The purpose of this conducting zone is to prevent discharge across the air space be-V.

wardly therefrom, an outwardly extending flange on said dielectric member, the outer portion of said flange being curved'downwardly, a petticoat extending downwardly from the lower face of said flange, a sheet metal bailie carried by said pin and extending outwardly beneath said flange and serving as a flux control to diffuse the electrostatic lines of, force emanating from said pin, said baflle being disposed entirely above the plane of the lower edge of said flange and having a circumferential groove, in its upper face registering with said petticoat and forming with said petticoat a labyrinthine passage to protect the surface of said insulator from contamination, and means for detachably securing said battle to said pin. v

4. An insulator comprising a dielectric member having a recess therein, a pin having one end thereof secured in said recess, a cap secured to said dielectric member for supporting said insulator, an outwardly and downwardly extendcharge from said pin, said means comprising a sheet metal bafile secured to and electrically connected with said pin and extending radially therefrom and forming a circumferential groove registering with the lower edge of said skirt and providing a fluxcontrol ring at the outer edge of said groove for preventing concentration of electrostatic stress emanating from said pin.

5. An insulator comprising a dielectric mem ber having a recess therein, a pin having one end secured in said recess, a cap secured to said dielectric member for supporting said insulator, said dielectric member having an outwardly and downwardly extending flange thereon enclosing a-sheltered space about the lower end of said pin, a pair of radially spaced circumferential skirts extending downwardly from the lower face of said flange, a sheet metal baflie secured in said pin and extending radially therefrom, said bafllehaving a circumferential groove in its upper face registering with the innermost one of said skirts, the outer edge of said bai'fleextending into theopening between said skirts, said bafiie having a drainage opening therethrough at the bottom of said groove, and a supplemenetal baffle plate for breaking up air currents through said drainage opening.

6. An insulator comprising a dielectric body having a radially extendingflange, a fitting pro-1 body and a combined flux control and. baflle 'jecting downwardly from the lower side of said formed of conducting material and secured to and electrically connected with said fitting and. 

